Steam, watergas and pipesPipe couplings for food and fire fightingindustriesMotion transmissionAircraft and aerospaceOil and gas
BSPT Taper Pipe ThreadNPTF AmericanDIN 405 RoundISO Trapezoidal 30°ACME AmericanUNJAPI Buttress CasingAPI Round Casing & Tubing
r=0.137278P 27.5° 27.5° 90° 1.78° r=0.137278P30° 30° 90° 1.78°r=0.221047P 30° r=0.238507P r=0.255967P30° 0.366P29° 0.3707P60° 0.125P r=0.18042P1.78° 3° 10° 90°30° 30° 90° 1.78°
BSPT R(PT) Rc(PS) RpNPTFRdTr (TM)ACME (Tw)UNJBCSGCSG LCSG
thread/inchthread/inchthread/inchmmthread/inchthread/inchthread/inchthread/inch
28 19 14 11 –27 18 14 11.5 8 –10 8 6 4 –1.5 2.0 3.0 4.0 5.0 –12 10 8 6 5 –32 16 28 14 24 12 20 10 18 8 –5 –10 8 –
1.75 5.016 716 6
2.014 614 5
13 512
0.5 –1.5(48–16)48–160.5 –1.548–16
1.75–3.0(14– 8)14– 81.75–3.014– 8
3.5 –5.0(07– 5)7– 53.5 –5.07– 5

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